Tractor attached excavator



Feb. 15, 1955 IVES 2,702,137

TRACTOR ATTACHED EXCAVATOR Filed Sept. 12, 1950 2 Sheets-Sheet 1 Loran 6- Ives Feb. 15, 1955 1.. G. IVES 2,702,137

TRACTOR ATTACHED EXCAVATOR Filed Sept. 12, 1950 2 Sheets-Sheet 2 I n ventor Loran 6. Ives United States Patent TRACTOR ATTACHED EXCAVATOR Lora'n G. Ives, Linden, N. J.

Application September 12, 1950, Serial No. 184,485

3 Claims. (Cl. 214-147) The present invention relates to new and useful improvements in excavators and more particularly to a tractor attached excavator constructed for digging graves, ditches or other types of excavations requiring perpendicular walls.

An important object of the invention is to provide a novel sectional boom construction for a clam shell bucket whereby the bucket may be moved perpendicularly without the use of cables and the rigging usually required therefor.

Another object is to provide hydraulic operating means for the several sections of the boom, as well as for the opening and closing of the bucket.

A further object is to provide a novel hydraulic operating device for turning the mast to which the boom is attached in order to swing the bucket from side to side.

A still further object is to provide an excavator which may be mounted as a unit on a tractor without necessitating any changes or alterations in the construction thereof and wherein the excavator includes vertically adjustable supports resting on the ground to prevent tilting of the tractor.

Another object is to provide an apparatus of this character of simple and practical construction, which is ellicient and reliable in operation, relatively inexpensive to manufacturing and otherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a top plan view.

Figure 2 is a side elevational view.

Figure 3 is a rear elevational view.

Figure 4 is an enlarged fragmentary sectional view showing the mast turning mechanism and taken on a line 44 of Figure 3.

Figure 5 is a side elevational view of the bucket and hydraulic operating means therefor.

Figure 6 is an elevational view of the bucket, and

Figure 7 is an enlarged fragmentary vertical sectional view of the upper bearing from the mast.

Referring now to the drawings in detail, wherein for the purpose of illustration I have disclosed a preferred embodiment of my invention, the numeral 5 designates a substantially rectangular shaped frame which is welded or otherwise suitably fixed to the rear ends of a pair of arms 6 which underlie the rear axle 7 of a tractor 8 and are secured thereto by U-bolts 9. The front ends of arms 6 are rigidly connected to each other by a cross bar 10 which extends transversely under the tractor forwardly of the rear axle to prevent downward swinging movement of the rear ends of the arms by the weight of the frame and the mechanism attached thereto. Braces 11 extend from the upper portion of frame 5 to arms 6.

Upper and lower fixed bearing pins 12 are secured to the upper and lower portions of frame 5 by attaching plates 13 and on which the ends of a hollow mast 14 are journalled. The mast is turned by a pair of hydraulic cylinders 15 pivoted for horizontal swinging movement at one end on brackets 16 carried by a rear cross bar 17 attached to arms 6. The cylinders 15 are provided with plungers 18 working therein and to the outer euds of which the ends of a cable 19 are attached and which embraces the mast and secured thereto at the center of the cable by a clamp 20.

2,702,137 Patented Feb. 15, 1955 A sectional boom, designated generally at 21, includes an inner section 22, outer section 23 and a center or intermediate section 24. Inner section 22 is pivoted at its inner end to mast 14 by means of a pair of plates or brackets 25 welded or otherwise suitably secured to the sides of the mast and having bearings 26 in which trunnions 27 on the boom section 22 are pivoted. The outer end of boom section 22 is similarly pivoted as at 28 to center or intermediate boom section 24 at a point adjacent its inner end and the outer end of center or intermediate boom section 24 is similarly pivoted as at 29 to outer boom section 23 at a point adjacent the inner end of the latter.

A hydraulic cylinder 30 is pivoted at one end to the lower portion of mast 14 by means of a bracket 31 and includes a plunger 32 working in the cylinder and having its outer end pivoted to the outer portion of inner boom section 22 by a bracket 33.

A hydraulic cylinder 34 is pivoted at one end to the inner boom section 22 by a bracket 35 and also includes a plunger 36 working in the cylinder 34 and having its outer end pivoted to the inner end of center boom section 24 A hydraulic cylinder 37 similarly connects the inner end of outer boom section 23 to center boom section 24.

Outer boom section 23 is hollow and constructed to form a hydraulic cylinder having a plunger 38 working therein and attached at its outer end to the jaws 39 of a clam shell bucket 40, and which are connected to outer boom section 23 by links 41.

The plungers for hydraulic cylinders 30, 34, 37 and 23 are double acting for movement inwardly and outwardly by hydraulic pressure and to hold the plungers in either inwardly or outwardly or in a desired intermediate position, the several cylinders being connected to a battery of control valves 42 mounted at the upper portion of frame 5 and which in turn are connected to a source of fluid pressure (not shown).

Vertically swingable arms 43 are pivoted at their front ends to brackets 44 attached to the rear portion of arms 6 and the arms 43 are provided with pivoted feet 45 at their rear ends to rest on the ground rearwardly of the tractor. Hydraulic cylinders 46 are attached to the lower side portions of frame 5 and are connected to the arms 43 to raise and lower the latter.

The hydraulic cylinders 15 and 46 are also connected to the control valves 42.

In the operation of the device, arms 6, with'frame 5 and the excavating mechanism carried thereby, are attached as a unit to axle 7 of tractor 8 to support the frame and excavating mechanism rearwardly of the tractor. Cross bar 10 prevents tilting of the tractor by the weight of the mechanism.

Hydraulic cylinders 30,- 34 and 37 are operated by the control valves 42 to raise or lower the several boom sections 22, 23 and 24 to a desired position and with outer boom section 23 held perpendicularly. The hydraulic cylinder internally of outer boom section 23 is then operated to open and close the bucket 40 to grab a load of dirt.

The bucket is then raised by boom section 22 and 24 while outer boom section 23 is manipulated by hydraulic cylinder 37 to maintain the outer boom section perpendicularly and mast 14 is then turned toward either side by the hydraulic cylinder 15.

The pivotal movement of the boom sections enables the outer boom section 23 to be raised and lowered perpendicularly to a depth substantially equal to the length of the boom.

In view of the foregoing description taken in conjunction with the accompanying drawings it is believed that a clear understanding of the device will be quite apparent to those skilled in the art. A more detailed description is accordingly deemed unnecessary. It is to be understood, however, that even though there is herein shown and described a preferred embodiment of the invention the same is susceptible to certain changes fully comprehended by the spirit of the invention as herein described and the scope of the appended claims.

Having described the invention, what is claimed as new is:

1. An excavator comprising a mast, a sectional boom pivoted at its inner end to the mast and including an inner vertically pivoted section, an outer'vertically pivoted section, and a center vertically pivoted section, said center section being pivoted to both the inner and outer sections and all of said sections being swingable into and out of a substantially longitudinally extended position with respect to each other, independent hydraulic operating means for each section and including a hydraulic cylinder pivoted to the mast and having a piston work ing therein pivoted to the underside of the inner boom section, a second hydraulic cylinder pivoted at the upper side of the inner boom section and having a piston working therein pivoted to the rear end of the center boom section, and a third hydraulic cylinder pivoted on top of the center boom section and having a piston working therein pivoted to the rear end of the outer boom section, and a bucket at the outer end of said outer section.

2. An excavator comprising a mast, a sectional boom pivoted at its inner end to the mast and including an inner vertically pivoted section, an outer vertically pivoted section, and a center vertically pivoted section, said center section being pivoted to both the inner and outer sections and all of said sections being swingable into and out of a substantially longitudinally extended position with respect to each other, independent hydraulic operating means for each section and including a hydraulic cylinder pivoted to the mast and having a piston working therein pivoted to the underside of the inner boom section, a second hydraulic cylinder pivoted at the upper side of the inner boom section and having a piston working therein pivoted to the rear end of the center boom section, and a third hydraulic cylinder pivoted on top of the center boom section and having a piston working therein pivoted to the rear end of the outer boom section, a bucket at the outer end of said outer section, and hydraulic operating means for the bucket mounted internally of said outer section.

3. In an excavator, a sectional boom including an inner vertically pivoted section, and outer vertically pivoted section, and a center vertically pivoted section, said center section being pivoted to both the inner and outer sections and all of said sections being swingable into and out of a substantially longitudinally extended position with respect to each other, independent hydraulic operating means for each section, said outer section being hollow and including a hydraulic cylinder, and a bucket carried by the outer section and operated by said cylinder.

References Cited in the file of this patent UNITED STATES PATENTS 105,883 Bailey Aug. 2, 1870 1,603,573 Baker Oct. 19, 1926 1,728,761 Hojnowski Sept. 17, 1929 2,109,388 Heller Feb. 22, 1938 2,295,917 Schwan Sept. 15, 1942 2,351,104 Carter June 13, 1944 2,411,498 Billings Nov. 26, 1946 2,477,401 Billings July 26, 1949 2,479,841 Jordan Aug. 23, 1949 2,559,733 Pitman et a1. July 10, 2,560,674 Westall July 17, 1951 2,639,826 Welden May 26, 1953 OTHER REFERENCES Publication by Wain-Roy Corporation of Hubbardstown, Mass. (Copy received Div. 4, U. S. Patent Ofiice June 12, 1950. (Sherman Power Digger) SP 547.) 

